Top Definition
a train that does not need tracks in order to move from point a to point b. usually very dangerous and can strike without warning. in some severe cases, the all terrain train may find where you live and try to get you.
"dude where's phill today?"

"he's stuck at home with 3 all terrain trains circling his house... all he can do is wait."

"oh... ok?'
by asilb5877 October 24, 2010
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